My bf doesn’t like my 3 year old

I’m unsure how to edit this question to add details, so I guess I’ll leave a comment and hope this works.
My bf and I have been together for almost 2 years. My son and my bf don’t “get along”. My bf thinks my 3 year old needs to be medicated. He tells me he doesn’t like him and that he never listens. I don’t know what else to say. I’m so upset right now coming to the realization that this relationship may have to end because of his absolute dislike for my child. It’s not just my bf, my 3 (almost 4) year old doesn’t like him either. I think it’s because he feels the dislike from my bf? I also have a 6 and 5 year old who adore my bf. And my bf loves them too. I’m so confused, willing to hear any advice on this subject.

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